Follow-Up: Yes there is a differince. Cause the link to the subconsciense is greatly affected by hormone levels and neuro-transmiters. Specifecly serotonin and melatonin. melatonin rules more at night and relaxes the external scences, so that the the great ego and Id can reveal itself. You can simulate this by creating darkness and sleep in the daytime, but remember rem sleep is in a series of steps and is hard to duplacate that,to that extent in the day time. Also the direction that you sleep can affect rem and dreams. Such as, North or South, East and West. This affects the homestaces in the body and thus affects rem!!! Hope I was helpfull Mark